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Member postings for Steamer1915

Here is a list of all the postings Steamer1915 has made in our forums. Click on a thread name to jump to the thread.

Thread: Myford Metric Lathe Leadscrew
10/04/2023 10:24:00
Posted by Barry Dyson on 10/04/2023 07:35:06:

Hello Steve,

Thank you for replying to my query about Tumbler Gears on a Myford Super 7.

Have you ever considered (or actually made) your tumbler replacement gears with Oilite Bronze bushes in the bore?

If so was the inclusion of the Oilite bush effective in reducing heat build up at the tumbler gear bore under high speed (high RPM) application?

The reason I ask is that I recently acquired a relatively new Super 7 (that was held in storage for decades) and experienced a problem when turning the OD of a medium length & medium dia steel shaft at high RPM and while using machine feed rather than manual feed.
It is unfortunate that you need to run the Leadscrew to obtain machine feed on the Myford and therefore one or both of the tumbler gears needs to be engaged under load.
* However after turning for some time I noticed considerable heat build up at the bore of the tumbler gear.
- It is now evident (by gear removal and replacement) that the oilway to that gear was partially blocked by some of the original wax coating from when the machine was new and therefore that gear bearing was not receiving proper oiling, only partial oiling. Luckily no damage was done. However, I believe that if an oilite bush was included in the tumbler gears their bearing areas would not have heated up nearly as quickly as did the Tufnol material running directly on the steel Pin. Also, a suitable oilite bush of 5/8" x 7/16" x 3/8" long would add minimal cost.

What are your thoughts?

Since then I have thought about making a variable speed DC + Geared drive unit to rotate the leadscrew independently from the handwheel (tail stock) end and thereby eliminate the need for the gear train to be engaged at all when turning at high RPM's. Experiments in design and development of this drive unit will begin soon.

Regards, Barry

Edited By Barry Dyson on 10/04/2023 07:35:57

Hello Barry,

I haven't done anything along the lines of fitting Oilite bushes to the Tumbler gears. I see no reason to. I think in many respects you have answered your own question when you state that there was clearly a lack of lubrication.

I have done a lot of work over the years at elevated speeds on my S7 and never had any issues with overheating of the tumbler gears. Correct lube is the answer...

Best regards,

Steve.

09/04/2023 08:20:57
Posted by Barry Dyson on 08/04/2023 12:23:54:

On the subject of Tumbler Gears and 34T + 33T "Metric" screw cutting gears for Myford lathes.

Can anyone inform me whether Stephen Tracey is still around and still frequenting this forum?
- I believe Stephen used to make and sell the two Tufnol Tumbler replacement gears.

Indeed he is. I am that man.

Please PM me if you (or anyone else) would like to progress this.

I have recently supplied Myford with Tufnol gears for the S7/ML7R.

They are also available on eBay under the same user name that I use on this forum.

I also supply the 18T & 20T equivalents for the ML7.

My best regards,

Steve.

Thread: Graham meek reduction unit
20/09/2022 22:12:39

Hi All,

I am currently making another batch of these dials (along with a version for the tailstock) and hopefully these will be ready early next year.

Best regards,

Steve.

Thread: Turning between centres on Super 7
22/02/2022 12:45:54
Posted by Neil Lickfold on 21/02/2022 20:56:51:

I have made parts between centres, where I use the centre taper to be the driver.

I finish parts in the same way. The centre shafts for the carriage dial are roughed out using collets and then finished between centres.dsc01978.jpg

Thread: Fusion 360 Whitworth Threads
22/01/2021 09:53:46

Hi Chris,

Could you send me a PM please?

Best regards,

Steve.

Thread: Gear Supplier - special
06/10/2020 10:05:23

Pressure angle?

Steve.

Thread: Tempering and Gear Cutting
24/07/2020 10:07:11
Posted by Peter Howell 1 on 24/07/2020 09:47:37:

Right.

So if I'm going to make a gear how to I know what pressure angle to use for the job in hand?

Is it all down to experience or are there some specified design criteria ?

LINK was an interesting post about a month ago.

Best regards,

Steve.

Thread: Fusion 360 Whitworth Threads
20/07/2020 11:51:20

Mike,

I have found the XML document for the BSW threads. Not sure if this works for BSF as well, the thread form being the same, just the difference in TPI. I don't know how to upload them here but I have your email address and will send you them that way, along with the BSP+Nonstandard Threads file. Not sure what's in the latter without checking.

How to upload an XML document to this site? Anyone?

Best regards,

Steve.

20/07/2020 10:01:56

I'm sure I have the Whitworth and BA threads somewhere. Give me a while and I'll try to find them.

Be aware though that every time Fusion 360 updates, they seem to be thrown out and you need to re-load them.

Steve.

Thread: Graham Meek?s Tailstock Dial - MEW279
23/05/2020 11:11:36
dsc01919.jpgdsc01709.jpgdsc01704.jpgPosted by Martin Kyte on 23/05/2020 10:31:31:

No, I've got a planing fixture and it takes about 20 mins to index round so it's quicker in the end.

regards Martin

I'm with you on this Martin. When I make a batch of Graham's Saddle dials, I use a rig where the slotting head drives a rotary table via a seven tooth ratchet wheel. Each dial takes around 7 mins and the "knurl" is perfect everytime. The dial on your lathe was done exactly like that. There are 504 "teeth" if you care to count them. I shall use a similar rig when I get around to making the tailstock dials. I have made a 6 tooth ratchet for that job - that produces a very similar pitch to the saddle dial even though the diameter of the knurled diameter is smaller.

Best regards,

Steve.

 

dsc01703.jpg

Edited By Steamer1915 on 23/05/2020 11:13:30

14/05/2020 18:10:44
Posted by Martin Kyte on 14/05/2020 13:59:53:

So thats the Tail Stock Topslide and Saddle taken care of. (The Saddle is Graham Meek supplied). All I need now is to make George Thomas' Cross slide modification with a sensible sized lockable micrometer and I'm sorted. Who needs DRO's on Lathes.

I believe you bought the Saddle Handwheel from me at Harrogate in (believe it or not) 2014.

My best regards,

Steve.

14/05/2020 13:14:49

Nice work there Martin.

Steve.

Thread: Eagle Surface grinder - who here uses one?
03/05/2020 10:08:27

Love the de-mag on the top there.

Thread: Clarkson autolock help
29/04/2020 09:51:52

I'm sure we have been here before but you should not back off the nut (not even an eighth of a turn) before screwing the cutter home against the centre point. There must not be a gap between the nut and the body. The cutter will self tighten depending on how high the cutting forces. The cutter will not screw into the body any further when it does this. All that happens is that when the cutter turns, it forces the collet downwards into the taper of the nut and this in turn increases the grip on the cutter. If you have a gap between the nut and the main body, you will most likely (especially on the 6mm or 1/4" shanks) break out the centre in the end of the cutter when the nut is tightened.

(dons tin helmet)

Steve.

Thread: Graham Meek?s Tailstock Dial - MEW279
27/04/2020 08:40:53

That looks good Brian,

It might be to your advantage to fill the lines and numbers with black paint.

Just a thought.

Best regards,

Steve.

25/04/2020 20:32:21

Nice work there Brian,

Let's see a picture of it on the tailstock!

Steve.

Thread: Fake Mitutoyo indicator on Ebay
25/04/2020 09:10:10
Posted by Barrie Lever on 23/04/2020 10:32:36:

I checked the indicator on my granite table with tungsten slip gauges (all bought off of Ebay and absolutely superb quality) going from 20mm slips to 20.1 I could already see errors, probably OK for someone like SOD Dave as an exponent of near enough is good enough but the indicator is not staying in my workshop.

What sort of errors were you seeing? Were they cosine errors that you would see when using the stylus at angle? A pear shaped stylus would reduce these errors.

Link

Steve.

Thread: ML7-R tumbler gears
19/04/2020 11:26:02

Social distancing in the workshop gave me the opportunity to make a batch of these gears.

More pictures in the album showing the process.

Material is Tufnol Whale brand.

DP is 20

Pressure angle is 20 degrees

OD 30T = 1.600" 28T = 1.500"

Very pleased with the results.dsc02525.jpg

Best regards,

Steve.

Edited By Steamer1915 on 19/04/2020 11:31:41

Thread: Essential and non-essential workers lockdown rules
09/04/2020 13:29:53

There has been a lot in the media lately about the police taking a heavy handed approach when “enforcing the lockdown rule”.

I was listening to Radio 5 yesterday and there was an interesting call from a self employed tradesman who had been reported by the neighbours of the person whose house he was working at. I gained the impression that he was laying a block paved drive or something similar. He stated that he was observing all the social distancing measures but that the police had stopped by and told him that he had to stop work because he was not an essential worker and if he continued, he would be prosecuted. The chap duly stopped work, made the site safe and returned home. All good so far.

Those of you that know me will be aware that I have a workshop that is about four miles away from my home and that I make dials and other accessories for the model engineering fraternity.
Whilst I would never class myself as a key worker, I have carried on as usual, based on the fact that a) I travel alone in the car and b) I work alone in the workshop.

What is the point of all this? Well, it’s this:-

Another caller on the aforementioned radio programme mentioned that the original advice given at the start of the lockdown (and subsequently emailed to police forces country wide) was soon afterwards edited and is now different to the common (mis) conception about key workers.

Pasted below are the relevant paragraphs from the government website

LINK

6. How can I find out if my work is essential or not?
The government is not saying only people doing “essential” work can go to work. Anyone who cannot work from home can still go to work.

Every worker – whether critical or not – should work from home if they can but may otherwise travel to work.

I’m taking that to say my common sense approach is not breaking any guidelines or laws. I intend to print a copy of the relevant paragraphs and carry them with me in the car.

Please feel free to share this information. It may help someone who is unsure.

Steve.

Edited By Steamer1915 on 09/04/2020 13:31:15

Edited By Steamer1915 on 09/04/2020 13:41:57

Thread: Graham Meek?s Tailstock Dial - MEW279
08/04/2020 11:48:15

Martin,

PM sent.

Best regards,

Steve.

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